WPF: how to make normal listbox left-drag-select behavior use middle mouse instead?

Question

I'm building a special listbox control that our designers want customized in some tweaky ways.

One thing they want to see is that the middle button-drag does what the left button-drag normally does (we are repurposing left-drag to other things).

So it needs the two key features that left-drag does in a ListBox default implementation:

1. While holding down the button and dragging, the selection starts where I click down and extends to where I drag.
2. While dragging outside the listbox region, it scrolls if there is scrollable space in that direction.

Before I go an duplicate this functionality by hand, is there any easy way to fool ListBox into thinking it's getting left-mouse drag events but instead is getting middle-mouse?

Answer 1

MouseDown will help you. It monitors all mice. Here's a good article on it. http://blogs.msdn.com/b/nickkramer/archive/2005/06/13/428754.aspx

from the article:

We have MouseLeftButtonDown and MouseRightButtonDown events, but no MouseMiddleButtonDown event. You can get at the middle button by using the attached event Mouse.MouseDown, which listens to all mouse buttons, and check for args.ChangedButton == MouseButton.Middle.